Hey Eng. By looking at your temps I would say you O'd on Thursday (CD17). You are likely to release an egg 24 - 36 hours after the positive OPK so that's pretty close to fitting. It's too hard to tell due to the lack of pre O temps. Do you get much EWCM? I noticed you have 2 days of CP checking noted, did you check any other days? I find if my temps are playing havoc, I can always tell by my CM & CP